Keeping a cast of the original shape of tools - Woodworking Talk - Woodworkers Forum
 
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post #1 of 9 Old 01-23-2012, 10:06 PM Thread Starter
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Keeping a cast of the original shape of tools

After owning a bowl gouge for a while which I thought was close to an Ellsworth grind I bought a new tool which is in fact the Ellsworth grind and saw how different my version had been. Being aware that the shape could drift considerably over time I'm looking to keep an "original" to refer to in the future, so tonight I used "Shape Lock" plastic to form a mold and once the plastic hardened I poured plaster of paris in my mold to try to create a copy of the original shape of the tool - now I'm waiting for it to harden and see if I can get it out.

Besides taking pictures, has anyone else tried to keep a copy of the reference shape of their tools? If so, how?
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post #2 of 9 Old 01-23-2012, 10:23 PM
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When I first opened the engraving school I used to give students castings of oversize gravers so they had a sharpening reference.

I used silicone mold rubber and urathane plastic from Smooth On. Smooth ons tech help is really good. Give them a call explain to them what your wanting to do and they will help you with selecting the best mold and casting materials.

If you google Smooth On casting you will find their website.

Ray

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post #3 of 9 Old 01-23-2012, 10:49 PM
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Quote:
Originally Posted by sprior View Post
Being aware that the shape could drift considerably over time I'm looking to keep an "original" to refer to in the future ...
I've never done it, but it's a great idea.

You can never have too much pepperoni on your pizza or own too many clamps.
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post #4 of 9 Old 01-24-2012, 08:51 PM Thread Starter
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Ray, last night I made a mold using the Shape Lock and filled it with plaster, but today when I managed to get the plaster free the result wasn't satisfactory. I just ordered Rebound 25 and Smooth-Cast 320 from Smooth On. This seems to be another project going way over budget, but this stuff sounds way cool to play with.
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post #5 of 9 Old 01-27-2012, 10:44 PM Thread Starter
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I got the materials from Smooth On and took a crack at it. The silicone molds were too thin at the sharp edges and had leaks higher up, but the tip of the bowl gouge came out surprisingly well, the detail gouge was a bit rougher. I'm trying again with a new mold, but what I've already got is actually good enough for use as a reference. This little project is probably overkill (I'm into overkill sometimes), but might be worth it if a bunch of turners did it as a group project.
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post #6 of 9 Old 01-28-2012, 12:07 AM
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Very cool! Glad that worked out. Those don't look to bad to me. I mean you can see the angles and contours pretty easily.

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post #7 of 9 Old 01-30-2012, 10:08 PM Thread Starter
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Even though the first try was good enough for the use, it wasn't good enough for me to declare victory and move on, but the second try was MUCH better - this batch makes you think you can sharpen them up and use them. Now that I've got my permanent reference I really sharpened those chisels last night and am looking forward to taking them for a spin.
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post #8 of 9 Old 01-31-2012, 08:26 AM
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Those look great. What kind of sharpening equipment and jigs are you using on the Ellsworth? I have an Ellsworth 3/8" gouge and am afraid to sharpen it for fear I will screw up the profile! I took a bunch of pictures and measured it all over.
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post #9 of 9 Old 01-31-2012, 08:42 AM Thread Starter
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For the detail gouge I'm using the Tormek with their gouge jig, but for the bowl gouge I've switched to the Ellsworth jig on the Wolverine base. I did notice that when I sharpened the bowl gouge for the first time it did change shape a little to match my setup - the tip bevel matched, but the angle of the grind on the wings didn't get full contact. I don't know what the manufacturer used to form the original shape.
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